Photographic material



April 23, 1935. A. voN Bu-:HLER 1,998,530

I PHOTOGRAPHIC MATERIAL v Filed Aug. 4, 1931 "ma m' af @Mk n/aoogf'a'c 5 77777/W7/77/77/7/777//77/7/YYYYYW/WWYW7777777777@ In venfor 'retreated Apr. 23, 193s 1,998,530

UNITED STATES PATENT OFFICE PHOTOGRAPHIC MATERIAL Arpad von Biehler, Dessau in Anhalt, Germany,

assignor to Agfa Ansco Corporation, Binghamton, N. Y., a corporation of New York Application August 4, 1931, Serial No. 555,080 In Germany August 8, 1930 7 Claims. (Cl. '95-2) My present invention relates to light-sensitive soluble dyes may be incorperated in this colloid photographic materials and more particularly to layer- AS 8 C0110d 0f the kind deSCribed I may such materials as used, for instance, in color use abietic acid which is very well suited. but photography. other colloids such as nitro-cellulose and acetyl- One of its objects is to provide photographic cellulose," Preferably When mede into Very thin l materials bearing on their light-sensitive emul- .layers are likewise suitable. There may also be sion layer a. colored lter layer. used water-insoluble dyes combined with water- Further objects of the invention will be seen insoluble colloids which are soluble in organic from the detailed speciication following heresolvents andcan be destroyed by a suitable after- 10 after, reference being made to the accompanying treatment. m drawing showing in cross section in an enlarged There can be used for the coloration, of course, scale a photographic iilm made according to the also mixtures of dyes, or dyes and colloids having invention, the properties required. The layers can be col- Processes are known for providing light-sensiored, for insta-nee. by mating, Spraying 01 dipping tive photographic layers, which are intended for processes. Y

the preparation of negatives on which the indi- The following examples illustrate the invention. vidual color sensations are registered, on their EImple 1.A Silver bromide gelatin layer iS surfaces. with filter layers, so that only light of colored on the surface with a 10% alcoholic soluilxed wave lengths can act upon the underlying tion of water-insoluble Aurine (cf. Schultz.

@o layer of the light-sensitive material. Water- Farbstoitabellen, 6th edition. No. 555). 20

soluble dyes are used for this purpose, since the The dye is rendered water-soluble by the treatdye has to be removed by the photographic treatment in the photographic developer and fixing ing liquids, in order that it may not interfere bath and, therefnle, Washed 011i?. with the printing operation. When using, how- In the foregoing exemple the Water-insoluble ever, water-soluble dyes, the dye diffuses into the Allrne may be substituted. 01 instance, by g5 emulsion layer during pr01onged storage of the Resoflavine W (771), Alizarine-black WR (774), photographic material, owing to the natural mois- Purpurine (783), Cyanoslne (soluble in alcohol) ture content of the layer, and this may detri- (594) and Galloeyanine (626). The numbers mentally effect the sensitiveness of the emulsion given relate to Schultz, Farbstofltabellen, 6th

layer. If, for instance. in a three-pack process edition. 30 a yellow filter layer is arranged behind a layer Instead of Acridine orange there may be used sensitive to blue light, the sensitiveness is con- Uranine (cf. Schultz, Farbstoitabellen, 6th edisiderably reduced, by diffusion of the yellow dye tien, No. 585)- The eollodion solution may be into the emulsion layer sensitive to blue light. replaced by a 0.1% solution of cellulose acetate.

According to my present invention, this draw- Example 2.-A silver bromide gelatin layer is 35 back is avoided by coating the surface of the coated witha thin layer of a 5% alcoholic abietic emulsion layer with a layer containing a wateracid. Then a mixture of equal parts of a 10% insoluble dye, which is decolorized or rendered alcoholic solution of abietic acid and of a 1% water-soluble by the action of the photographic solution of Violamine R soluble in alcohol (color treating liquids or by a special after-treatment. acid, cf. Schultz, Farbstofftabellen, 6th edition, o The filter layer may likewise be made of a water- No. 582), in alcohol is applied thereto. Before insoluble colloid which is destroyed or rendered the development the dye is eliminated by a treatsoluble in the photographic treating liquids or ment in a sodium hydroxide solution of 1/2% by a special after-treatment. strength.

For the dye layer applied to the surface of the In the accompanying drawing A is a support 5 emulsion layer there are especially suitable those for the light-sensitive emulsion B. which either water-insoluble dyes which are soluble n organic is colored by a water-insoluble dye or which may solvents, and preferably those which, owing to bear a further layer C (indicated in the drawing the presence of acid or hydroxyl groups, are caby dotted lines), in which the water-insoluble pable of forming water-soluble alkali salts. If dye is incorporated. 50 the fllter is made up of a colloid layer, the colloid My invention isv not limited to the foregoing being insoluble in water but soluble in the phoexamples or to the vspeciiic details given therein. tographic liquids` or a special after-treatment Numerous other dyes and colloids are suitable the bath, and being preferably soluble in organic solqualification of which can easily be determined vents, any dyes, water-insoluble as well as water by a few simple experiments. 55

What I claim isz- 1. With a photographic material comprising a support provided with a light-sensitive emulsion, a color filter applied to the surface of said emulsion layer, said lter consisting of a mixture of a dye and a colloid which is insoluble in water but soluble in the photographic treating baths.

2. With a photographic material comprising a. support provided with a light-sensitive emulsion, a color lter applied to the surface of said emulsion layer, said filter consisting of a mixture of a. dye and a colloid which is insoluble in water but soluble in the photographic treating baths and in organic salts.

3. With a photographic material comprising a support provided with' a light-sensitive emulsion, a color lter applied to the surface of said emulsion layer, said filter consisting of a mixture of a. dye and a colloid both being insoluble in water but soluble in the photographic treating liquids and in organic solvents.

4. With a photographic material comprising a support provided with a light-sensitive emulsion, a color illter applied to the surface of said emulsion layer, said filter comprising a dye which is insoluble in water but soluble in the photographic treating baths.

5. With a photographic material comprising a support provided with a light-sensitive emulsion, a color filter applied to the surface of said emulsion layer, said lter consisting of water insoluble aurine.

6. With a photographic material comprising a support provided with a light-sensitive emulsion, a color iilter applied to the surface oi said emulsion layer, said filter consisting of gallocyanine.

'1. With a photographic'material comprising a support provided with a light-sensitive emulsion, a color lter applied to the surface of said emulsion layer, said filter consisting of abietic acid and violamine,

ARPAD v. BIEHLER.

CERTIFICATE 0E CORRECTION.

Patent No. 1,998, 530. A April Z3, 1935.

' ARPAD von BIEHLER.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 2, lfirst column, line 14, claim 2, for "salts" read solvents; and that the said Letters Patent should be read with this correction therein that the -same may conform to the record of the case in the Patent.

Office. v

Signed and sealed this 6th day of August, A. D. 1935.`

Leslie Frazer (Seal) Acting Commissioner of Patents. 

